<template>
    <div>
      <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
      </el-breadcrumb>
  
      <!-- 卡片视图 -->
      <el-card>
        <!-- 添加角色按钮区域 -->
        <el-row>
          <el-col>
            <el-button type="primary">添加角色</el-button>
          </el-col>
        </el-row>
  
        <!-- 角色列表区域 -->
        <el-table :data="rolelist" border stripe>
          <!-- 展开列 -->
          <el-table-column type="expand">
            <template slot-scope="scope">
              <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                <!-- 渲染一级权限 -->
                <el-col :span="5">
                  <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <!-- 渲染二级和三级权限 -->
                <el-col :span="19">
                  <!-- 通过 for 循环 嵌套渲染二级权限 -->
                  <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                    <el-col :span="6">
                      <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                      <i class="el-icon-caret-right"></i>
                    </el-col>
                    <el-col :span="18">
                      <el-tag type="warning" v-for="item3 in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                    </el-col>
                  </el-row>
                </el-col>
              </el-row>
  
              <!-- <pre>
                {{scope.row}}
              </pre> -->
            </template>
          </el-table-column>
          <!-- 索引列 -->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="角色名称" prop="roleName"></el-table-column>
          <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
          <el-table-column label="操作" width="300px">
            <template slot-scope="scope">
              <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
              <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
              <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-card>
  
      <!-- 分配权限的对话框 -->
      <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
        <!-- 树形控件 -->
        <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
        <span slot="footer" class="dialog-footer">
          <el-button @click="setRightDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
      </el-dialog>
    </div>
  </template>
  
  <script>
  export default {
    data() {
      return {
        // 所有角色列表数据
        rolelist: [],
        // 控制分配权限对话框的显示与隐藏
        setRightDialogVisible: false,
        // 所有权限的数据
        rightslist: [],
        // 树形控件的属性绑定对象
        treeProps: {
          label: 'authName',
          children: 'children'
        },
        // 默认选中的节点Id值数组
        defKeys: [],
        // 当前即将分配权限的角色id
        roleId: ''
      }
    },
    created() {
      this.getRolesList()
    },
    methods: {
      // 获取所有角色的列表
      async getRolesList() {
        const { data: res } = await this.$http.get('roles')
  
        if (res.meta.status !== 200) {
          return this.$message.error('获取角色列表失败！')
        }
  
        this.rolelist = res.data
  
        console.log(this.rolelist)
      },
      // 根据Id删除对应的权限
      async removeRightById(role, rightId) {
        // 弹框提示用户是否要删除
        const confirmResult = await this.$confirm(
          '此操作将永久删除该文件, 是否继续?',
          '提示',
          {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }
        ).catch(err => err)
  
        if (confirmResult !== 'confirm') {
          return this.$message.info('取消了删除！')
        }
  
        const { data: res } = await this.$http.delete(
          `roles/${role.id}/rights/${rightId}`
        )
  
        if (res.meta.status !== 200) {
          return this.$message.error('删除权限失败！')
        }
  
        // this.getRolesList()
        role.children = res.data
      },
      // 展示分配权限的对话框
      async showSetRightDialog(role) {
        this.roleId = role.id
        // 获取所有权限的数据
        const {data: res} = await
        this.$http.get('rights/tree')
  
        if (res.meta.status !== 200) {
          return this.$message.error('获取权限数据失败！')
        }
  
        // 把获取到的权限数据保存到 data 中
        this.rightslist = res.data
        console.log(this.rightslist)
  
        // 递归获取三级节点的Id
        this.getLeafKeys(role, this.defKeys)
  
        this.setRightDialogVisible = true
      },
      // 通过递归的形式，获取角色下所有三级权限的id，并保存到 defKeys 数组中
      getLeafKeys(node, arr) {
        // 如果当前 node 节点不包含 children 属性，则是三级节点
        if (!node.children) {
          return arr.push(node.id)
        }
  
        node.children.forEach(item => this.getLeafKeys(item, arr))
      },
      // 监听分配权限对话框的关闭事件
      setRightDialogClosed() {
        this.defKeys = []
      },
      // 点击为角色分配权限
      async allotRights() {
        const keys = [
          ...this.$refs.treeRef.getCheckedKeys(),
          ...this.$refs.treeRef.getHalfCheckedKeys()
        ]
  
        const idStr = keys.join(',')
  
        const { data: res } = await this.$http.post(
          `roles/${this.roleId}/rights`,
          { rids: idStr }
        )
  
        if (res.meta.status !== 200) {
          return this.$message.error('分配权限失败！')
        }
  
        this.$message.success('分配权限成功！')
        this.getRolesList()
        this.setRightDialogVisible = false
      }
    }
  }
  </script>
  
  <style lang="less" scoped>
  .el-tag {
    margin: 7px;
  }
  
  .bdtop {
    border-top: 1px solid #eee;
  }
  
  .bdbottom {
    border-bottom: 1px solid #eee;
  }
  
  .vcenter {
    display: flex;
    align-items: center;
  }
  </style>